Register to reply

COMSOL example model results do not match with Mathematical Model

by Oscar6330
Tags: cantilever, comsol
Share this thread:
Oscar6330
#1
Jun12-11, 12:43 AM
P: 29
Hi! I started to look into freq response analysis of a cantilever beam using COMSOL. Luckily COMSOL already has an example model "Model Library>> Structural mechanics module>>Dynamics and Vibrations>>rotating blade". While not changing anything in the model and with Omega=0 and Cloris =0, I get the following results

Resonance Freq1 = 84.36
Resonance Freq2 =528.84
Resonance Freq3 =949.31

Resonance Freq4 =1316.00
Resonance Freq5 =1481.41
Resonance Freq6 =2882.00

But Euler beam theory (options>>constants) gives me the following

Resonance Freq1 = 84.36
Resonance Freq2 =528.66
Resonance Freq3 =1862.89

Resonance Freq4 =3650.55
Resonance Freq5 =6034.61
Resonance Freq6 =9064.89

Clearly the results do not match after 2nd natural/ resonance freq. I am quite sure that COMSOL example model cannot be wrong but there is something odd. Some elaboration would be appreciated
Phys.Org News Partner Physics news on Phys.org
Optimum inertial self-propulsion design for snowman-like nanorobot
The Quantum Cheshire Cat: Can neutrons be located at a different place than their own spin?
A transistor-like amplifier for single photons
Mech_Engineer
#2
Jun13-11, 11:56 AM
Sci Advisor
PF Gold
Mech_Engineer's Avatar
P: 2,242
You're wanting to solve a cantilever beam modal analysis, but used a rotating blade vibration analysis. How are the boundary conditions defined?


Register to reply

Related Discussions
Looking for a COMSOL or ANSYS model/tutorial (for the design) of a solenoid Math & Science Software 2
COMSOL moving boundary model Mechanical Engineering 0
Mathematical Model of a Wind Tunnel Model Aerospace Engineering 1
How to model Soil layers in COMSOL Mechanical Engineering 1